I think I will have to return NULL to get MVC to send back just a HTTP Response message to the sender URL (the wireless device).
"...IF you want the response to be treated and displayed as a string, you are already there.
IF you want the response to be parsed (XML, CSV, some other format) THEN will have to write some response handling code, which I suppose will be called a web client. There is no useful framework for REST clients as far as I know but it should be simple....
I wrote: "...I think I will have to return NULL to get MVC to send back just a HTTP Response message to the sender URL (the wireless device)...."
Your response: "...Why not use HTTP response codes to communicate or just send an empty response body? MVC is pretty intuitive, don't worry too much about it. The main thing is not to get your M tangled up with V and C. ...."
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